Atmosphere/exosphere/uart.c
2018-02-22 19:27:01 +00:00

33 lines
704 B
C

#include "uart.h"
volatile void *g_uart_registers = NULL;
void set_uart_address(void *uart_base) {
g_uart_registers = uart_base;
}
inline void *get_uart_address(void) {
return g_uart_registers;
}
void uart_initialize(uint16_t divider) {
/* Setup UART in 16450 mode. We assume the relevant UART clock has been enabled. */
/* Disable FIFO */
UART_IIR_FCR_0 = 0x00;
/* Set DLAB */
UART_LCR_0 = 0x80;
UART_THR_DLAB_0_0 = (uint8_t)divider;
UART_IER_DLAB_0_0 = (uint8_t)(divider >> 8);
/* 8N1 mode */
UART_LCR_0 = 0x03;
}
void uart_transmit_char(char ch) {
/* Wait for THR to be empty */
while (!(UART_LSR_0 & 0x20)) {}
UART_THR_DLAB_0_0 = ch;
}